GTA02 voltage chart
andy at openmoko.com
Wed Jul 16 14:29:53 CEST 2008
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Somebody in the thread at some point said:
| The SYS voltage is basically max(USB, BAT) and all the PMU's regulators
| are supplied from it.
... with the qualification that this is after the USB current limit for
USB path, and the BAT path is subject to a much larger current limit
(1.6 -> 2.2A, I think we use 2.2A) too.
It's worth mentioning because it's this that makes the
no-battery-no-boot problem on devices with VB_SYS cap that isn't
sufficient to hide the effect of VB_SYS not getting enough current from
USB to service its loads via the regulators. Normally the Battery fills
in via its higher current path.
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